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A fast-curing lightweight board suitable for prefabricated buildings and its preparation method

A fast curing and assembled technology, applied in the field of building materials, can solve the problems of low early strength, slow setting time, slow strength development, etc., and achieve the effect of good stability and high early strength

Active Publication Date: 2021-06-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing lightweight boards are mainly cement-based, which has disadvantages such as slow setting time, low early strength, and slow strength development, which severely limits the production cycle of the production line, resulting in a significant drop in output, and the cement-based material itself has the problem of shrinkage and cracking It also limits its application to some extent
Chinese patent CN106565181A discloses a preparation method of lightweight concrete prefabricated slabs, which can realize demoulding within 6 to 8 hours, and has the characteristics of high finished product strength and light surface density. Defects include chemical shrinkage, drying shrinkage and carbonization shrinkage, etc., which cannot overcome the shortcomings of sheet shrinkage and cracking

Method used

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  • A fast-curing lightweight board suitable for prefabricated buildings and its preparation method
  • A fast-curing lightweight board suitable for prefabricated buildings and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Prepare a fast-curing lightweight board suitable for prefabricated buildings. The raw materials and weight parts are: 70 parts of cement, 20 parts of grade II fly ash, composite early strength agent (sulfoaluminate cement and sodium sulfate according to the quality Ratio 10:1 Compounding) 4 parts, phosphogypsum dihydrate 6 parts, phosphogypsum dihydrate whiskers 3 parts, EPS 1.1 parts, nano-silica sol 0.3 parts, water reducing agent 0.2 parts, air-entraining agent 0.05 parts, water retention dose 0.1 part.

[0027] According to the above formula, weigh cement, secondary fly ash, composite early strength agent, phosphogypsum dihydrate, and phosphogypsum dihydrate whiskers and dry mix for 60 seconds, add nano-silica sol, water reducing agent, air-entraining agent, and water-retaining agent. At the same time, add water according to the water-to-material ratio of 0.34 and stir in the mixer for 2 minutes, then add EPS particles into the mixer and stir for 3 minutes, inject t...

Embodiment 2

[0030] To prepare a fast-curing lightweight board suitable for prefabricated buildings, the raw materials and weight parts are as follows:

[0031] 80 parts of cement, 10 parts of grade II fly ash, 2 parts of composite early strength agent (obtained by compounding sulphoaluminate cement and sodium sulfate at a mass ratio of 10:1), 10 parts of dihydrate phosphogypsum, dihydrate phosphogypsum crystal 5 parts of whiskers, 1.3 parts of EPS, 0.1 parts of nano-silica sol, 0.1 parts of water reducing agent, 0.1 parts of air-entraining agent, and 0.15 parts of water-retaining agent.

[0032] According to the above formula, weigh cement, secondary fly ash, composite early strength agent, phosphogypsum dihydrate, and phosphogypsum dihydrate whiskers and dry mix for 60 seconds, add nano-silica sol, water reducing agent, air-entraining agent, and water-retaining agent. At the same time, add water according to the water-to-material ratio of 0.34 and stir in the mixer for 2 minutes, then ad...

Embodiment 3

[0035] To prepare a fast-curing lightweight board suitable for prefabricated buildings, the raw materials and weight parts are as follows:

[0036] 60 parts of cement, 30 parts of grade I fly ash, 6 parts of composite early strength agent (obtained by compounding sulphoaluminate cement and sodium sulfate at a mass ratio of 10:1), 5 parts of dihydrate phosphogypsum, dihydrate phosphogypsum crystal 1 part of whisker, 0.6 part of EPS, 0.5 part of nano silica sol, 0.3 part of superplasticizer

[0037] According to the above formula, weigh cement, secondary fly ash, composite early strength agent, phosphogypsum dihydrate, and phosphogypsum dihydrate whiskers and dry mix for 60 seconds, add nano-silica sol, water reducing agent, air-entraining agent, and water-retaining agent. At the same time, add water according to the water-to-material ratio of 0.31 and stir in the mixer for 2 minutes, then add EPS particles into the mixer and stir for 3 minutes, inject the prepared slurry into t...

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Abstract

The invention relates to a fast-curing lightweight board suitable for prefabricated buildings and a preparation method thereof. The raw material components and parts by weight of the fast-curing lightweight board are as follows: 60-80 parts of cement, 10-30 parts of fly ash , 2-6 parts of composite early strength agent, 5-10 parts of phosphogypsum, 1-5 parts of fiber, 0.6-1.3 parts of light aggregate, 0.1-0.5 part of nano-silica sol, 0.1-0.3 part of water reducing agent, air-entraining agent 0‑0.1 part, water retaining agent 0‑0.15 part. The fast-curing lightweight board provided by the present invention has high early strength and no shrinkage in the later stage. It reaches the demolition strength in 8h-12h, and the strength in 1d reaches more than 60% of the strength in 28d. The bulk density is 600-1000Kg / m 3 It can be adjusted within the range, the thermal conductivity is lower than 0.15W / (m K), good stability, no obvious delamination and cracking, and can be used as prefabricated wall panels for prefabricated buildings.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a fast-curing lightweight board suitable for prefabricated buildings and a preparation method thereof. Background technique [0002] As a new direction of architectural development, prefabricated buildings have been increasingly popularized. Lightweight panels can be used as prefabricated wall materials, and their development and application play an important role in the development of prefabricated buildings. Existing lightweight boards are mainly cement-based, which has disadvantages such as slow setting time, low early strength, and slow strength development, which severely limits the production cycle of the production line, resulting in a significant drop in output, and the cement-based material itself has the problem of shrinkage and cracking It also limits its application to a certain extent. Chinese patent CN106565181A discloses a preparation method of lightweig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B111/40
CPCC04B28/04C04B2111/40C04B2201/20C04B2201/32C04B2201/50C04B18/08C04B22/147C04B7/32C04B22/144C04B14/383C04B16/08C04B14/062C04B24/24C04B24/20C04B24/383
Inventor 马保国金子豪李玉博戚华辉孙仲达
Owner WUHAN UNIV OF TECH
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